The Flash 6×12 “A Girl Named Sue” Season 6 Episode 12 Promo – WHEN RALPH MET SUE – After months of searching for Sue Dearbon (guest star Natalie Dreyfuss), Ralph (Hartley Sawyer) gets a lead on her whereabouts and finally comes face to face with his missing client. However, Sue refuses to return home to her family, and instead, takes Ralph on a daring adventure. Iris (Candice Patton) faces a new challenge while Barry (Grant Gustin) considers a potentially dangerous request from a trusted source. Chris Peppe directed the episode written by Thomas Pound & Lauren Certo (#612). Original airdate 2/18/2020.